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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext2/xattr_trusted.c
3 * Handler for trusted extended attributes.
4 *
5 * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 */
7
8#include <linux/module.h>
9#include <linux/string.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/ext2_fs.h>
13#include "xattr.h"
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000016ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
17 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070018{
Shen Fengf905f062008-07-25 01:46:15 -070019 const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 const size_t total_len = prefix_len + name_len + 1;
21
22 if (!capable(CAP_SYS_ADMIN))
23 return 0;
24
25 if (list && total_len <= list_size) {
26 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
27 memcpy(list+prefix_len, name, name_len);
28 list[prefix_len + name_len] = '\0';
29 }
30 return total_len;
31}
32
33static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000034ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
35 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
37 if (strcmp(name, "") == 0)
38 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000039 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 buffer, size);
41}
42
43static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000044ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
45 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 if (strcmp(name, "") == 0)
48 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000049 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 value, size, flags);
51}
52
Stephen Hemminger749c72e2010-05-13 17:53:16 -070053const struct xattr_handler ext2_xattr_trusted_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 .prefix = XATTR_TRUSTED_PREFIX,
55 .list = ext2_xattr_trusted_list,
56 .get = ext2_xattr_trusted_get,
57 .set = ext2_xattr_trusted_set,
58};